Weather is made of unequal heating & earth spinning. High heat beaming down at the equator lifts air up, lowering air pressure. The warm air is driven pole-ward where it cools, sinks, and increases in pressure. The friction and the Coriolis effect sends the air eddying around the globe.	Temperature Pressure Humidity Wind Speed Clouds Precipitation

Air masses--a volume of air defined by its temperature and water vapor content--interact along fronts.